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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab6e0b8ec212b9df5b98de0652eca9a5d3aceb3fc8a891d0db6a105becd461ac' 
  AND token = 'tona4lUesiem9xYKv/sv51JBSpMJF7uZYO/QuFegpIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}